Loud explosion while backwashing black tank

Lantley wrote:
Lesson to learn from all this is black tank does not need to be spotless.
Don't obsess over the cleanliness of the tank. It's ok to rinse it out but no matter what you do there will always be residual stuff.
Trying to get it spotless can create serious issues. Why get it spotless when all you are going to do is fill it up again?
I slowly learned myself, that obsessing over the black tank is counterproductive. A quick rinse or 2 and be done with it.
While I understand overfilling was an accident, there is no need to fill tank to the point of causing an issue. You should have quit filling long before the point of rupture. Quick rinses is all you need.
If you have odors use chemicals occasionally or as needed to eliminate odors.
Repeated long fills are unnecessary, Especially fills long enough to rupture tank.
Lastly you cannot trust tank monitors to determine fill level. Use a timer. Decide how long it takes to fill tank based on time. I never let my 40 gallon tank go longer than 5 minutes. Using a clear elbow I watch what comes out. Usually one or 2 rinses is all it takes. I also back wash black tank with gray water which works very well.
If it is not convenient I do not flush at all. If I am camping again in the near future I do not flush at all.
Once you get things back in order, I suggest you change to a less rigorous flush routine.
There is simply no need to take the risk of causing damage, think quick rinses vs. long fill ups.

Probably very good advice. I have a black tank flush but don't see much point in overdoing it. I drain the tank, then use the black tank flush to refil about 1/2 way then drain again, at that point I'm done. It's not like I'm planning on drinking out of it.

I overfilled the Fresh tank one time and I guess I'm lucky I didn't damage anything.